Bullseye Compatibility

So far only some cleanup and added variables for bullseye around explicit version checks that were already in place. Probably needs further changes for full compatibility, so leaving as WIP for now. Esp. thinking of python2 here. This includes some basic changes, esp. needed for our first migrations. Further changes to be expected as we move more hosts to bullseye.

uwsgi-python/tasks/apps/pgadmin4.yml

@@ -13,7 +13,7 @@
 - name: Enable Postgres APT repository
   apt_repository:
     # yamllint disable-line rule:line-length
-    repo: "deb https://apt.postgresql.org/pub/repos/apt/ {{ debian_version }}-pgdg main"
+    repo: "deb https://apt.postgresql.org/pub/repos/apt/ {{ ansible_distribution_release }}-pgdg main"
 
 - name: Debconf pgadmin4
   debconf:
@@ -35,7 +35,7 @@
   apt:
     name: python3-flaskext.wtf
     default_release: stretch-pgdg
-  when: debian_version == "stretch"
+  when: ansible_distribution_release == "stretch"
 
 - name: Fix directory permissions
   file: